Take your gin and measure 2 oz using your jigger. Pour the gin into your glass over the ice.
Take your 7up and measure 4 oz using your jigger. Pour the 7up into your glass over the ice.
Take your bar spoon and use it to gently, but completely stir the two ingredients together.
(optional garnish) Slice a lemon of lime into slices. Take one and cut a small notch in middle of it in the pulp. Place it on the rim of your glass using the notch you cut.